CN104060973B - The method that reasonable dividing point is established in the transformation of water-injection station dividing potential drop - Google Patents
The method that reasonable dividing point is established in the transformation of water-injection station dividing potential drop Download PDFInfo
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Abstract
The method that reasonable dividing point is established in the transformation of a kind of water-injection station dividing potential drop, setting water-injection station can carry out Partial pressure water injection at any pressure spot, assumes dividing point by setting 21 with 0.5MPa for an interval in water injection pressure 3MPa to 13.5MPa scope；Calculate each hypothesis dividing point Partial pressure water injection scheme water-injection station and export minimum useful work；Calculate unit efficiency in the water-injection station of each hypothesis Partial pressure water injection scheme；Calculate the energy consumption assuming dividing point Partial pressure water injection scheme water-injection station；The preferred lowest energy consumption scheme of comparison, by the energy consumption comparison of each hypothesis dividing point Partial pressure water injection scheme water-injection station, can draw some lowest energy consumption Partial pressure water injection schemes；Output investment ratio is to preferred optimal case, the Adjustment and reform engineering proposal of water injecting pump unit in the water-injection station station of some lowest energy consumption Partial pressure water injection schemes and station outside ductwork are adjusted engineering proposal be designed, the investment amount of each scheme is contrasted, namely can select the water-injection station Partial pressure water injection scheme that investment lowest energy consumption is minimum.
Description
Technical field
The present invention relates to the method that reasonable dividing point is established in the transformation of a kind of water-injection station dividing potential drop, find out Scientific Approaches and theoretical template that water-injection station dividing potential drop transformation lowest energy consumption dividing point selects, provide an effective and rapid rational approach for high pressure centrifugal pump water-injection station dividing potential drop energy saving technical reconstruction.
Background technology
Current rejection of oil flied effluent pattern is essentially: Produced Liquid carries out oil and gas and water at sewage plant and enters water-injection station from rear sewage by low-pressure adjusting water system, centrifugal high pressure pumping plant transport to each distributing room for water injection of outer net after it being boosted and carry out re-injection to individual well again.And in whole process, owing to each individual well in-place permeability difference is big, water pressure demand is differed, what height differed greatly even can reach more than 10MPa, but water flooding pump station outlet pressure is the highest constant requirements, this results in can exist valve control in whole system running and retain, this inevitable link of energy loss.In the system that fractional water flooding pressure gap is big, energy loss is very serious, and whole system efficiency is also far below normal value.The selection of the core dividing point of current centrifugal high pressure pumping plant dividing potential drop renovation technique is all established by tentative calculation, unsturdy theoretical foundation and fully demonstration.And in the process that the transformation of whole dividing potential drop is implemented, the establishment of the dividing point most important thing exactly, it will directly influence the height of the energy-saving and cost-reducing effect of dividing potential drop transformation and whole engineering input.Namely the purpose of the present invention is the theoretic discussion by each hypothesis dividing point Partial pressure water injection scheme water-injection station being exported unit efficiency in minimum useful work, water-injection station, the computational methods of water-injection station energy consumption carry out, find out Scientific Approaches and theoretical template that water-injection station dividing potential drop transformation lowest energy consumption dividing point selects, provide an effective and rapid rational approach for high pressure centrifugal pump water-injection station dividing potential drop energy saving technical reconstruction.Water-injection station is carried out dividing potential drop transformation by of this sort system and has just possessed Necessity and feasibility.Namely the present invention wins nine water filling regions for Shengli Oil Field triumph oil recovery factory, is set forth in and how to carry out dividing potential drop transformation at the reasonable dividing point of this regional choice and system energy consumption just can be made minimum and put into minimum, most effective.Also theoretical foundation is provided for centrifugal high pressure water flooding pump station Partial pressure water injection energy saving technical reconstruction from now on.
Summary of the invention
It is an object of the invention to provide the method that reasonable dividing point is established in the transformation of a kind of water-injection station dividing potential drop, overcome the defect that above-mentioned prior art exists.
The technical scheme is that and be accomplished by:
A, setting water-injection station can carry out Partial pressure water injection at any pressure spot, will set 21 with 0.5MPa for an interval and assume dividing points in water injection pressure 3MPa to 13.5MPa scope；
B, calculate each hypothesis dividing point Partial pressure water injection scheme water-injection station export minimum useful work；Calculate the water injection rate of water-injection station high-pressure system when each assumes to carry out under dividing point Partial pressure water injection and the water injection rate of low-pressure system, extrapolate each by the water injection pressure of high-low pressure flood pattern and water injection rate and assume that dividing point Partial pressure water injection scheme water-injection station needs the minimum useful work of output；
C, calculate unit efficiency in the water-injection station of each hypothesis Partial pressure water injection scheme, each is assumed that Partial pressure water injection scheme mates a set of water injecting pump unit, the water injecting pump pump efficiency of every sets of plan is tried to achieve according to different displacements centrifugal pump pump efficiency curve, take constant motor efficiency, unit efficiency in each water-injection station assuming Partial pressure water injection scheme can be calculated；
D, calculate assume dividing point Partial pressure water injection scheme water-injection station energy consumption, by each assume dividing point Partial pressure water injection scheme water-injection station need output minimum useful work and water-injection station in unit efficiency can calculate each assume dividing point Partial pressure water injection scheme water-injection station energy consumption；
E, the preferred lowest energy consumption scheme of comparison, by the energy consumption comparison of each hypothesis dividing point Partial pressure water injection scheme water-injection station, can draw some lowest energy consumption Partial pressure water injection schemes；
F, output investment ratio are to preferred optimal case, the Adjustment and reform engineering proposal of water injecting pump unit in the water-injection station station of some lowest energy consumption Partial pressure water injection schemes and station outside ductwork are adjusted engineering proposal be designed, the investment amount of each scheme is contrasted, namely can select the water-injection station Partial pressure water injection scheme that investment lowest energy consumption is minimum.
The calculation procedure of minimum useful work:
Calculate water-injection station pump pressure
Predict after the retrofit scheme of every mouthful of water injection well that the computational methods of water injection well demand water-injection station pump pressure are as follows:
Pf=Δ P+Py=Pb-Pg+Py
Wherein: after Pf---retrofit scheme, predict water injection well demand water-injection station pump pressure, units MPa；
The current water-injection station of Δ P---damages to the actual pipe of distributing room for water injection, units MPa；
The current water-injection station pump pressure of Pb---, units MPa；
The current distributing room for water injection dry-pressing of Pg---, units MPa；
The current water injection well distributing room for water injection oil pressure of Py---, units MPa.
Calculate water injection rate
Each hypothesis dividing point dividing potential drop modification scheme high and low pressure system water yield cheek formula is as follows:
Qg (x)=Qj (x～x+0.5)+Qj (x+0.5～x+1) ...+Qj (13～13.5)
Qd (x)=Qj (0～3)+Qj (3～3.5)+Qj (3.5～4) ...+Qj (x-0.5～x)
Wherein: Qg (x)---assume modification scheme high-pressure system water injection rate, unit m3；
Qd (x)---assume modification scheme low-pressure system water injection rate, unit m3；
Qj (x～x+0.5)---it is distributed in it will be assumed that the interval individual well water yield of dividing point x to x+0.5MPa, unit m3；
X----assumes modification scheme high and low pressure system dividing point, units MPa.
Calculate minimum useful work
Each minimum useful work assuming the output of dividing point waterflood project high-low pressure part.
Wg=Qg (x) × 13.5
Wd=Qd (x) × x
Wy=Wg+Wd
Wherein: Wg represents that the system against high voltage part water yield rises to 13.5MPa work done, unit J
Wd represents that the low-pressure section water yield is risen to x work done, unit J by system
Wy represents the minimum useful work that water-injection station exports, unit J
Unit efficiency calculation procedure:
Simulate the pump efficiency curve chart (Fig. 5 Fig. 6) in two any discharge capacity situations
According to each model centrifugal pump discharge capacity-pump efficiency corresponding relation of current domestic current production, simulate pump efficiency curve chart in two any discharge capacity situations (the upper and lower pumpage of DF160-pump efficiency corresponding relation changes greatly).
Below DF160: y=18.41ln (x)+24.03,
More than DF160: y=0.217x+74.91
Wherein: y representation theory pump efficiency
X represents pumpage (x is any discharge capacity in 0～500 scope)
Pump-type preferably calculates with pump efficiency
According to two matched curves, it is assumed that certain dividing point pumpage demand is Am3(A > 500), two pumps discharge capacity respectively Zm3And Ym3Then can obtain following relation: Z+Y=A (Z, Y≤500), two pumps pump efficiency is then: ∮=[(18.41ln (Z)+24.03] × Z+ (0.217Y+74.91) × Y}/A, or ∮=[(18.41ln (Z)+24.03] × Z+ [(18.41ln (Y)+24.03] × Y}/A
Wherein: ∮ represents the theoretical displacement after different pump-type combination
Z, Y represent the discharge capacity of two pumps respectively
Can drawing through deriving, when Z × Y is minimum, pump efficiency is maximum, and namely pump efficiency ∮ and Z (A-Z) is inversely proportional to, and two kinds of pumps that discharge capacity therefore should be selected when pump combines minimum and maximum mate, and under existing technical conditions, wherein a pumpage is 500m3/ h pump, another is then the remainder of demand discharge capacity.
Dividing point lowest energy consumption calculates
The computational methods of the input work of each total energy consumption assuming dividing point water-injection station and motor:
N=Wy/ ∮ (x)
Wherein: N is water-injection station total energy consumption, unit J
Wy calculates gained water-injection station to export minimum useful work, unit J before.
∮ (x) is for assuming the unit efficiency of dividing point x.
By calculating each hypothesis dividing point water-injection station total energy consumption:
Each hypothesis dividing point total energy consumption is multiplied by water-injection station standard mark consumption and obtains its power consumption,
Q=N × 0.2697kW h/m3MPa。
Wherein: q is power consumption, unit kW h
N is water-injection station total energy consumption, unit J
0.2697kW·h/m3MPa is for calculating gained standard mark consumption
When assuming that dividing point is 10.0MPa, 11MPa, power consumption is relatively low, respectively 76789kW h/ days, 77036kW h/ days.
The invention have the advantage that the theoretic discussion by each hypothesis dividing point Partial pressure water injection scheme water-injection station being exported unit efficiency in minimum useful work, water-injection station, the computational methods of water-injection station energy consumption carry out, find out Scientific Approaches and theoretical template that water-injection station dividing potential drop transformation lowest energy consumption dividing point selects, provide an effective and rapid rational approach for high pressure centrifugal pump water-injection station dividing potential drop energy saving technical reconstruction
Accompanying drawing explanation
Fig. 1-water filling schematic flow sheet
Fig. 2-water filling actual demand pump pressure scope normal distribution
Fig. 3-water yield-assume dividing point graph of a relation
Fig. 4-each hypothesis dividing point pumping plant output acting cartogram
Fig. 5-water filling discharge capacity less than 160 cubes pump efficiency curve charts per hour
Fig. 6-water filling discharge capacity more than 160 cubes pump efficiency curve charts per hour
Fig. 7-each hypothesis dividing point water-injection station total energy consumption curve chart
Fig. 8-each hypothesis dividing point the water yield-power consumption-dividing point graph of a relation
A-overall water injection plant B-water filling substation C-distributing room for water injection 1 in Fig. 1,2,3-water filling pound sign.
Detailed description of the invention
For disclosing technical scheme further, elaborated by embodiment below in conjunction with Figure of description:
The technical scheme is that and be accomplished by:
A, setting water-injection station can carry out Partial pressure water injection at any pressure spot, will set 21 with 0.5MPa for an interval and assume dividing points in water injection pressure 3MPa to 13.5MPa scope；
B, calculate each hypothesis dividing point Partial pressure water injection scheme water-injection station export minimum useful work；Calculate the water injection rate of water-injection station high-pressure system when each assumes to carry out under dividing point Partial pressure water injection and the water injection rate of low-pressure system, extrapolate each by the water injection pressure of high-low pressure flood pattern and water injection rate and assume that dividing point Partial pressure water injection scheme water-injection station needs the minimum useful work of output；
C, calculate unit efficiency in the water-injection station of each hypothesis Partial pressure water injection scheme, each is assumed that Partial pressure water injection scheme mates a set of water injecting pump unit, the water injecting pump pump efficiency of every sets of plan is tried to achieve according to different displacements centrifugal pump pump efficiency curve, take constant motor efficiency, unit efficiency in each water-injection station assuming Partial pressure water injection scheme can be calculated；
D, calculate assume dividing point Partial pressure water injection scheme water-injection station energy consumption, by each assume dividing point Partial pressure water injection scheme water-injection station need output minimum useful work and water-injection station in unit efficiency can calculate each assume dividing point Partial pressure water injection scheme water-injection station energy consumption；
E, the preferred lowest energy consumption scheme of comparison, by the energy consumption comparison of each hypothesis dividing point Partial pressure water injection scheme water-injection station, can draw some lowest energy consumption Partial pressure water injection schemes；
F, output investment ratio are to preferred optimal case, the Adjustment and reform engineering proposal of water injecting pump unit in the water-injection station station of some lowest energy consumption Partial pressure water injection schemes and station outside ductwork are adjusted engineering proposal be designed, the investment amount of each scheme is contrasted, namely can select the water-injection station Partial pressure water injection scheme that investment lowest energy consumption is minimum.
Specific embodiment:
One, the reasonable dividing point establishment method of water-injection station dividing potential drop energy saving technical reconstruction
(1) calculate each hypothesis dividing point Partial pressure water injection scheme water-injection station and export minimum useful work
1, the calculating of each water injection well demand water filling pump pressure
Win after the sewage that two multi-purpose stations that stick together process is boosted to 13.5MPa by high pressure centrifugal pump by nine water-injection stations and transport to each distribution well, by distribution well distribution to each individual well (such as Fig. 1).Wherein all there is pipe network loss in each (propping up) main line, single well pipeline, and distributing room for water injection exists valve control loss.Study a question for convenience, from source, to predicting after retrofit scheme that each water injection well demand water-injection station pump pressure is calculated.Implement front and back each (propping up) main line diameter, length, flow, flow velocity, material due to Partial pressure water injection scheme to be all designed according to oilfield flooding pipeline network design standard, it can be considered that each water flooding well pipe damage is consistent before and after the transformation of water-injection station dividing potential drop.So, predict after the retrofit scheme of every mouthful of water injection well that the computational methods of water injection well demand water-injection station pump pressure are as follows:
Pf=Δ P+Py=Pb-Pg+Py
Wherein: after Pf---retrofit scheme, predict water injection well demand water-injection station pump pressure, units MPa；
The current water-injection station of Δ P---damages to the actual pipe of distributing room for water injection, units MPa；
The current water-injection station pump pressure of Pb---, units MPa；
The current distributing room for water injection dry-pressing of Pg---, units MPa；
The current water injection well distributing room for water injection oil pressure of Py---, units MPa.
After calculating every mouthful of water injection well retrofit scheme, predict water filling pump pressure, be an interval section according to the every 0.5MPa of water filling pump pressure, it is possible to obtain the water injection well well number normal distribution in demand water injecting pump pressure pressure interval.From fig. 2 it can be seen that victory each water injecting pump pressure pressure interval of nine notes has water injection well well to exist substantially, distribution comparatively disperses.
2, each calculating assuming dividing point Partial pressure water injection scheme high-low pressure water injection rate
Water injecting pump is pressed in 3MPa to 13.5MPa scope and sets 21 with 0.5MPa for an interval assumes dividing point, according to the well number normal distribution that above-mentioned water injecting pump pressure pressure is interval, the high-low pressure part water yield of each hypothesis dividing point is added up respectively, less than (being equal to), the water filling actual demand pump pressure of water injection well supposes that the well water gauge of dividing point enters low-pressure system, the water filling actual demand pump pressure of water injection well counts high-pressure system more than the water yield supposing dividing point, and each hypothesis dividing point dividing potential drop modification scheme high and low pressure system water yield cheek formula is as follows:
Qg (x)=Qj (x～x+0.5)+Qj (x+0.5～x+1) ...+Qj (13～13.5)
Qd (x)=Qj (0～3)+Qj (3～3.5)+Qj (3.5～4) ...+Qj (x-0.5～x)
Wherein: Qg (x)---assume modification scheme high-pressure system water injection rate, unit m3；
Qd (x)---assume modification scheme low-pressure system water injection rate, unit m3；
Qj (x～x+0.5)---be distributed in it will be assumed that the interval individual well water yield of dividing point x to x+0.5MPa and, unit m3；
X----assumes modification scheme high and low pressure system dividing point, units MPa.
By calculating, obtain each hypothesis dividing point dividing potential drop modification scheme high and low pressure system water distribution (such as Fig. 3).The calculating exporting minimum useful work for next step water-injection station lays the foundation.
3, each calculating assuming that dividing point Partial pressure water injection scheme water-injection station exports minimum useful work
Rest under the situation of each hypothesis dividing point waterflood project dividing potential drop, the water yield of high-low pressure part and adherence pressure demand, computational methods according to mark consumption: 1 side's water promotes 1MPa work done, it is possible to obtain the minimum useful work (such as Fig. 4) of each hypothesis dividing point waterflood project high-low pressure part output.
Wg=Qg (x) × 13.5
Wd=Qd (x) × x
Wy=Wg+Wd
Wherein: Wg represents that the system against high voltage part water yield rises to 13.5MPa work done, unit J
Wd represents that the low-pressure section water yield is risen to x work done, unit J by system
Wy represents the minimum useful work that water-injection station exports, unit J
(2) calculating of unit efficiency in each water-injection station assuming Partial pressure water injection scheme
In the first most research, we are from the actual demand of each individual well water filling of outer net, along the direction of individual well distributing room for water injection water-injection station, the loss of drain control node, calculate each minimum useful work assuming that dividing point water-injection station needs do after obtaining dividing potential drop transformation.But this merit is also theory demands, there is electric efficiency, pump efficiency and pump dry-pressing during pumping station operation and differ from three factor impacts, and the change before and after dividing potential drop transformation of pump dry-pressing difference is little, and the impact of system holistic approach can be ignored substantially；Electric efficiency through investigating level domestic at present substantially all about 96%, the two factor not as the object studied herein, lower step we the pump efficiency in station is furtherd investigate.
At present, in 16MPa flood pattern, China's centrifugal multistage pump multiple centrifugal pump level of development basic condition is: under running relatively stable condition, discharge capacity can be up to 500m3/ h, pump-type is more big, and theoretical pump efficiency is more high, the highest can reach 83%.And the calculating of the high-low pressure water yield shows after dividing potential drop being transformed before us, part assumes that the dividing point water yield is likely larger than 500m3/ h, at this moment, we are accomplished by the combination of the pump by two reasonable discharge capacities and meet water filling demand, therefore how to determine that rational pump-type combines, and, energy consumption the highest in the hope of pump efficiency is minimum is the key point of lower step research.We divide three step researchs:
1, each coupling assuming Partial pressure water injection scheme water-injection station pump-type
After each hypothesis dividing potential drop point value is determined, according to corresponding high-low pressure part water yield cheek pump instantaneous displacement requirements (see table 1).When discharge capacity is less than or equal to 500m3During/h, use single centrifugal multistage pump multiple centrifugal pump；When discharge capacity is more than 500m3During/h, coupling combination need to be carried out with two pumps and meet discharge capacity demand.
Dividing point pump instantaneous displacement requirements respectively assumed by table 1
Discharge capacity demand is more than 500m3The hypothesis dividing point of/h co-exists in following 20 kinds of situations (such as table 2), for convenience of research, first fixes the pump-type of wherein 1 pump, and with every 50m3Carry out selecting pump as a step, these compound modes are studied, find out the mode that pump efficiency after combination is the highest.
Table 2 is more than 500m3/ h displacement pump combination statistical table
Next step finds out, according to different pumpages, the compound mode that pump efficiency is the highest.
2, the demonstration of single centrifugal multistage pump multiple centrifugal pump and multiple centrifugal pump coupling discharge capacity and relationship between efficiency
At present the total centrifugal multistage pump multiple centrifugal pump 36 of each water-injection station in triumph oil recovery factory, operates 17, these centrifugal pump discharge capacities and pump efficiency such as table:
Table 3: oil recovery factory is by water flooding pump station real pump effect statistical table
Substantially following the relation that the more big pump efficiency of discharge capacity is more high between these pump delivery and pump efficiencys, for looking for the theoretical pump efficiency of any displacement pump, first existing pumpage-theory pump efficiency relation is studied (such as table 4) by us.
Table 4: centrifugal pump discharge capacity-theory pump efficiency mapping table
According to each model centrifugal pump discharge capacity-pump efficiency corresponding relation of current domestic current production, simulate pump efficiency curve chart such as Fig. 5 in two any discharge capacity situations, 6 (the upper and lower pumpage of DF160-pump efficiency corresponding relation changes greatly).
Below DF160: y=18.41ln (x)+24.03,
More than DF160: y=0.217x+74.91
Wherein: y representation theory pump efficiency
X represents pumpage (x is any discharge capacity in 0～500 scope)
According to these two matched curves, it would be desirable to solve, by Theoretical Calculation, the discharge capacity demand mentioned in above table 2 and assume the preferred of 20 kinds of situation pump-type that dividing point co-exists in more than 500m3/h.
Assume that certain dividing point pumpage demand is Am3(A > 500), two pumps discharge capacity respectively Zm3And Ym3, then can obtain following relation: Z+Y=A (Z, Y≤500), two pumps pump efficiency is then: ∮=[(18.41ln (Z)+24.03] × Z+ (0.217Y+74.91) × Y}/A, or
∮=[(18.41ln (Z)+24.03] × Z+ [(18.41ln (Y)+24.03] × Y}/A,
Wherein: ∮ represents the theoretical displacement after different pump-type combination
Z, Y represent the discharge capacity of two pumps respectively
Can drawing through deriving, when Z × Y is minimum, pump efficiency is maximum, and namely pump efficiency ∮ and Z (A-Z) is inversely proportional to, and two kinds of pumps that discharge capacity therefore should be selected when pump combines minimum and maximum mate, and under existing technical conditions, wherein a pumpage is 500m3/ h pump, another is then the remainder of demand discharge capacity.
3, the calculating of unit efficiency in each water-injection station assuming Partial pressure water injection scheme
Research according to above discharge capacity-pump efficiency homologous thread, substitutes into formula by discharge capacity, can show that discharge capacity is less than or equal to 500m3During/h, single centrifugal multistage pump multiple centrifugal pump pump efficiency and when discharge capacity more than 500m3The average pump efficiency of two pumps coupling combination during/h.Each more than 500m3Dividing point Pump type selection such as table 5 of/h discharge capacity demand:
Table 5 is more than 500m3Statistical table joined by reasonable group of/h displacement pump
According to each pump-type theory pump efficiency computing formula, calculating each hypothesis dividing point high-low pressure part of theory pump efficiency, obtain the theoretical pump efficiency of whole system after two parts weighted average, electric efficiency unification calculates according to 96%, can obtain unit efficiency in each hypothesis dividing point station.(such as table 6)
Unit efficiency statistical table in dividing point station respectively assumed by table 6
(3) the preferred lowest energy consumption scheme of comparison in each hypothesis Partial pressure water injection scheme
By above two-part theoretical research, we obtain output work and the unit efficiency of pumping plant after each hypothesis dividing point dividing potential drop, and the energy consumption at station just can be made prediction by lower step, by the calculating of each hypothesis dividing point energy consumption height is determined reasonable dividing point.
1, win nine water-injection station standard mark consumptions to calculate
Win and produce basal conditions (table 7) nine notes 1-12 month in 2012:
Introduce standard mark consumption concept herein and namely win nine notes mark consumption when overall efficiency of standing is assumed to 100%, this concept is equivalent to all for water-injection station internal loss factors all to foreclose, namely it is 100% at electric efficiency, pump efficiency, water-injection station mark consumption under the state that pump dry-pressing difference is 0, the calculating for power consumption total after lower step dividing potential drop is laid the groundwork.The ruuning situation winning nine notes at present is average day water supply 17301m3, day power consumption 85465kW h, standard mark consumption 0.2697kW h/m3MPa。
2, each energy consumption calculation assuming dividing point Partial pressure water injection scheme water-injection station
The computational methods of the input work of each total energy consumption assuming dividing point water-injection station and motor:
N=Wy/ ∮ (x)
Wherein: N is water-injection station total energy consumption, unit J
Wy calculates gained water-injection station to export minimum useful work, unit J before
∮ (x) is for assuming the unit efficiency of dividing point x
By calculating each hypothesis dividing point water-injection station total energy consumption (such as Fig. 7).
Each hypothesis dividing point total energy consumption is multiplied by water-injection station standard mark consumption and obtains its power consumption:
Q=N × 0.2697kW h/m3MPa。
Wherein: q is power consumption, unit kW h
N is water-injection station total energy consumption, unit J
0.2697kW·h/m3MPa is for calculating gained standard mark consumption
When assuming that dividing point is 10.0MPa, 11MPa, power consumption is relatively low, respectively 76789kW h/ days, 77036kW h/ days.Such as Fig. 8
3, the preferred lowest energy consumption scheme of comparison
Contrast each dividing point total energy consumption curve chart it follows that when assuming that dividing point is 10.0MPa, 11.0MPa, power consumption is relatively low, respectively 76789kW h/ days, 77036kW h days.Dividing point does scheme comparison's analysis to select the two to assume, next step is according to centrifugal pump and station outside ductwork in its high-low pressure water yield coupling station, it is preferable that invest relatively low scheme.
(4) output investment ratio is proved to preferably optimum Partial pressure water injection scheme
1, the engineering design thinking of each dividing potential drop scheme and scheme are preferred
Engineering design thinking mainly follows following three points principle: (1) difference according to the different dividing point high-low pressure water yields, is fully reused by the renewal of the water injecting pump pump housing, motor, forms high-low pressure 2 and overlap pump group, and high-low pressure water injecting pump is standby each other；(2) high-low pressure part water knockout drum UNICOM, when low-pressure section goes wrong, high-pressure pump can supply water；(3) outside ductwork low-pressure line of standing fully reuses, the newly-built the least possible distributing room for water injection of correct position, high-low pressure water injection well distribute nearby, with the efficiently new outer net of minimum investment construction.
By Part III to energy consumption height research, we select 10MPa (scheme one) and two dividing points of 11MPa (scheme two) to be scheme comparison, do investment ratio.
2, water-injection station energy consumption index contrast before program prediction and transformation
Nine water-injection station days power consumption 85469kW h of victory before transformation, average pump efficiency 67.2%, after transformation, scheme one estimates day power consumption 76789kW h, year power cost saving 205.9 ten thousand yuan, scheme two estimates day power consumption 77036kW h, year power cost saving 200.1 ten thousand yuan.
Ruuning situation contrast table before and after table 8 dividing potential drop
Designed sector budget, the general item investment moon is 8,000,000 yuan, and 4 years recoverable.
Four, conclusion
1, the dividing potential drop modification scheme of water-injection station is the effective way of next step high-voltage energy-saving.
2, the key problem in technology of dividing potential drop transformation is in that the selection of dividing point, and the dynamics saved energy and reduce the cost is depended in the selection of dividing point.Whether dividing potential drop transformation is feasible depends on input-output ratio.
3, Scientific Approaches and theoretical template that the minimum investment dividing point of Partial pressure water injection lowest energy consumption selects are established herein.Theoretical foundation is provided for centrifugal high pressure water flooding pump station Partial pressure water injection energy saving technical reconstruction from now on.
Claims (4)
1. the method that reasonable dividing point is established in a water-injection station dividing potential drop transformation, it is characterised in that the transformation of water-injection station dividing potential drop is established the method for reasonable dividing point and is:
A, setting water-injection station can carry out Partial pressure water injection at any pressure spot, will set 21 with 0.5MPa for an interval and assume dividing points in water injection pressure 3MPa to 13.5MPa scope；
B, calculate each hypothesis dividing point Partial pressure water injection scheme water-injection station export minimum useful work；Calculate the water injection rate of water-injection station high-pressure system when each assumes to carry out under dividing point Partial pressure water injection and the water injection rate of low-pressure system, extrapolate each by the water injection pressure of high-low pressure flood pattern and water injection rate and assume that dividing point Partial pressure water injection scheme water-injection station needs the minimum useful work of output；
C, calculate unit efficiency in the water-injection station of each hypothesis Partial pressure water injection scheme, each is assumed that Partial pressure water injection scheme mates a set of water injecting pump unit, the water injecting pump pump efficiency of every sets of plan is tried to achieve according to different displacements centrifugal pump pump efficiency curve, take constant motor efficiency, unit efficiency in each water-injection station assuming Partial pressure water injection scheme can be calculated；
D, calculate assume dividing point Partial pressure water injection scheme water-injection station energy consumption, by each assume dividing point Partial pressure water injection scheme water-injection station need output minimum useful work and water-injection station in unit efficiency can calculate each assume dividing point Partial pressure water injection scheme water-injection station energy consumption；
E, the preferred lowest energy consumption scheme of comparison, by the energy consumption comparison of each hypothesis dividing point Partial pressure water injection scheme water-injection station, can draw some lowest energy consumption Partial pressure water injection schemes；
F, output investment ratio are to preferred optimal case, the Adjustment and reform engineering proposal of water injecting pump unit in the water-injection station station of some lowest energy consumption Partial pressure water injection schemes and station outside ductwork are adjusted engineering proposal be designed, the investment amount of each scheme is contrasted, namely can select the water-injection station Partial pressure water injection scheme that investment lowest energy consumption is minimum.
2. the method that reasonable dividing point is established in a kind of water-injection station dividing potential drop according to claim 1 transformation, it is characterised in that: each assumes that dividing point Partial pressure water injection scheme water-injection station needs the minimum useful work of output to be the water-injection station pump pressure by calculating and water injection rate calculates；
After the retrofit scheme of every mouthful of water injection well, the computational methods of prediction water injection well demand water-injection station pump pressure are:
Pf=ΔP+Py
=Pb-Pg+Py
Wherein: after Pf---retrofit scheme, predict water injection well demand water-injection station pump pressure, units MPa；
The current water-injection station of Δ P---damages to the actual pipe of distributing room for water injection, units MPa；
The current water-injection station pump pressure of Pb---, units MPa；
The current distributing room for water injection dry-pressing of Pg---, units MPa；
The current water injection well distributing room for water injection oil pressure of Py---, units MPa
Each hypothesis dividing point dividing potential drop modification scheme high and low pressure system water yield cheek method is:
Qg(x)=Qj (x～x+0.5)+Qj (x+0.5～x+1) ...+Qj (13～13.5)
Qd(x)=Qj (0～3)+Qj (3～3.5)+Qj (3.5～4) ...+Qj (x-0.5～x)
Wherein: Qg(x)---assume modification scheme high-pressure system water injection rate, unit m3;
Qd(x)---assume modification scheme low-pressure system water injection rate, unit m3;
Qj(x～x+0.5)---be distributed in it will be assumed that the interval individual well water yield of dividing point x to x+0.5MPa and, unit m3;
X----assumes modification scheme high and low pressure system dividing point, units MPa
The minimum useful work computational methods of each hypothesis dividing point waterflood project high-low pressure part output are:
Wg=Qg(x) × 13.5
Wd=Qd(x) × x
Wy=Wg+Wd
Wherein: Wg represents that the system against high voltage part water yield rises to 13.5MPa work done, unit J
Wd represents that the low-pressure section water yield is risen to x work done, unit J by system
Wy represents the minimum useful work that water-injection station exports, unit J.
3. the method that reasonable dividing point is established in a kind of water-injection station dividing potential drop according to claim 1 transformation, it is characterised in that: each assumes that in the water-injection station of Partial pressure water injection scheme, unit efficiency is to calculate by simulating the pump efficiency curve chart in two any discharge capacity situations；
According to each model centrifugal pump discharge capacity-pump efficiency corresponding relation of current domestic current production, simulate the upper and lower pumpage of pump efficiency curve chart-DF160 in two any discharge capacity situations-pump efficiency corresponding relation and change greatly；
Below DF160: y=18.41ln (x)+24.03,
More than DF160: y=0.217x+74.91
Wherein: y representation theory pump efficiency；
X represents pumpage, and x is any discharge capacity in 0～500 scope；
According to two matched curves, it is assumed that certain dividing point pumpage demand is Am3, A > 500, two pumps discharge capacity respectively Zm3And Ym3Then can obtain following relation: Z+Y=A (Z, Y≤500), two pumps pump efficiency is then: ∮=[(18.41ln (Z)+24.03] × Z+ (0.217Y+74.91) × Y}/A, or ∮=[(18.41ln (Z)+24.03] × Z+ [(18.41ln (Y)+24.03] × Y}/A
Wherein: ∮ represents the theoretical displacement after different pump-type combination
Z, Y represent the discharge capacity of two pumps respectively.
4. the method that reasonable dividing point is established in a kind of water-injection station dividing potential drop according to claim 1 transformation, it is characterised in that: each assumes that the energy consumption of dividing point Partial pressure water injection scheme water-injection station calculates by the following method；
Calculate the total energy consumption of each hypothesis dividing point water-injection station and the input work of motor:
N=Wy/∮(x)
Wherein: N is water-injection station total energy consumption, unit J
Wy calculates gained water-injection station to export minimum useful work, unit J before
∮ (x) is for assuming the unit efficiency of dividing point x
By calculating each hypothesis dividing point water-injection station total energy consumption
Each hypothesis dividing point total energy consumption is multiplied by water-injection station standard mark consumption and obtains its power consumption:
q=N×0.2697kW·h/m3MPa
Wherein: q is power consumption, unit kW h
N is water-injection station total energy consumption, unit J
0.2697kW·h/m3MPa is for calculating gained standard mark consumption
When assuming that dividing point is 10.0MPa, 11MPa, power consumption is relatively low, respectively 76789kW h/ days, 77036kW h/ days.
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